Khaz'goroth, shaper of mountains and canyons, is a male VanirTitan and the ultimate craftsman. He is a master of many arts and disciplines; with Eonar's help, he created Azeroth's dwarves, troggs, and perhaps, mountain giants. He crafted the mountains in which the Ironforge dwarves dwell — their kingdom’s name, Khaz Modan, means “mountains of Khaz.” A fiery, brooding entity, Khaz’goroth loves working at his forge and listening to tales of heroism and valor.[1]

During the empowering of the Dragon Aspects, Khaz'goroth granted dominion over the earth and deep places of the world to the noble Neltharion, the Aspect of the Black Dragonflight...who later became known as Deathwing.

He is wise in building architecture and engineering. He created and shaped the mountains of Azeroth with help of his creations, the Earthen.

Contents

This section concerns content exclusive to the Warcraft RPG, and thus unlikely to be canon.

"Khaz’goroth begins most conflicts by summoning an elemental swarm to aid him and using greater dispel magic on an obviously enchanted foe. He then casts Bigsby’s crushing hand, imprisonment, and avatar before entering melee." If reduced to low health while in combat, he uses wish — to flee, finish off his opponents, or return himself to full health, depending on the situation.[1]

Khaz’goroth the Shaper crafted this enormous hammer from ultrapure thorium, after which Aman’Thul and Norgannon worked together to enchant it. The hammer’s appearance suggests a smith’s tool more than a weapon, and indeed Khaz’goroth uses it at his forge. When he wields it in combat, however, it causes great seismic eruptions and splitting earthquakes.[4]

Khaz'goroth is most likely based on the Greco-Roman god of fire and the forge, Hephaestus (Latin Vulcan).
Additional inspiration might have been taken from Aulë, a Vala and one of the Ainur of the mythology of J.R.R. Tolkien, where Aulë was the creator of the dwarves (who called him Mahal, the Maker) and took part in forging the lands and mountains of Middle Earth.